Question for the guys but everyone is welcome to answer. Why would my guy best friend often talk about sex with me?

My guy friend usually talks to me about sex, but yesterday he asked if I would ever be friends with benefits with him. Could this be why he will often bring up sex in our conversations? Could it be because it turned him on?

Question for the guys but everyone is welcome to answer. Why would my guy best friend often talk about sex with me?
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